Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
iShares 20+ Year Treasury Bond ETF
TLT
|
+$272M |
| 2 |
Alphabet (Google) Class A
GOOGL
|
+$99M |
| 3 |
NVIDIA
NVDA
|
+$89.9M |
| 4 |
TSMC
TSM
|
+$87.7M |
| 5 |
Amazon
AMZN
|
+$61M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$518M |
| 2 |
Strategy Inc
MSTR
|
+$81.2M |
| 3 |
Alibaba
BABA
|
+$66.7M |
| 4 |
Advanced Micro Devices
AMD
|
+$44.3M |
| 5 |
Uber
UBER
|
+$41.3M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 0.41% |
| 2 | Consumer Discretionary | 0.22% |
| 3 | Healthcare | 0.17% |
| 4 | Communication Services | 0.15% |
| 5 | Financials | 0.13% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
651
PUT
Best Buy
BBY
$18.4B
| $15.3M | 0.01% |
207,600
-99,700
| -32% | -$8.22M |
|
652
CALL
Flutter Entertainment
FLUT
$17.3B
| $15.3M | 0.01% |
68,900
+46,100
| +202% | +$11.9M |
|
653
PUT
Alcoa
AA
$12.2B
| $15.2M | 0.01% |
498,300
-183,100
| -27% | -$6.41M |
|
654
CALL
Norwegian Cruise Line
NCLH
$8.87B
| $15.1M | 0.01% |
797,200
+14,800
| +2% | +$356K |
|
655
Coinbase
COIN
$43.8B
| $15.1M | 0.01% |
87,558
+10,334
| +13% | +$2.5M |
|
656
CALL
Realty Income
O
$60.6B
| $15M | 0.01% |
258,800
+124,000
| +92% | +$6.86M |
|
|
TYNS
657
CALL
DELISTED
Direxion Daily 7-10 Year Treasury Bear 1X Shares
TYNS
| $15M | 0.01% |
95,000
-116,500
| -55% | -$18.4M |
|
|
FISV
658
CALL
Fiserv Inc
FISV
$26.8B
| $14.9M | 0.01% |
67,300
+11,600
| +21% | +$2.54M |
|
659
CALL
Las Vegas Sands
LVS
$30B
| $14.8M | 0.01% |
384,300
-107,800
| -22% | -$4.76M |
|
660
PUT
Iron Mountain
IRM
$37B
| $14.8M | 0.01% |
172,500
+127,200
| +281% | +$12.3M |
|
661
PUT
Etsy
ETSY
$7.64B
| $14.8M | 0.01% |
314,200
-84,200
| -21% | -$4.31M |
|
662
CALL
APA Corp
APA
$12.8B
| $14.8M | 0.01% |
704,000
+48,200
| +7% | +$1.06M |
|
663
PUT
Biogen
BIIB
$29.2B
| $14.8M | 0.01% |
107,800
+21,500
| +25% | +$3.07M |
|
664
PUT
Deckers Outdoor
DECK
$14.2B
| $14.7M | 0.01% |
131,600
+96,000
| +270% | +$15.5M |
|
665
PUT
Duke Energy
DUK
$99.7B
| $14.7M | 0.01% |
120,300
-12,600
| -9% | -$1.44M |
|
666
CALL
RH
RH
$3.31B
| $14.7M | 0.01% |
62,500
-29,400
| -32% | -$10.2M |
|
667
CALL
Stryker
SYK
$119B
| $14.6M | 0.01% |
39,300
+3,700
| +10% | +$1.41M |
|
668
PUT
Domino's
DPZ
$10.6B
| $14.6M | 0.01% |
31,800
+9,900
| +45% | +$4.48M |
|
669
PUT
SoundHound AI
SOUN
$2.81B
| $14.5M | 0.01% |
1,791,400
-231,400
| -11% | -$2.88M |
|
670
Broadcom
AVGO
$1.89T
| $14.5M | 0.01% |
+86,845
| New | +$18.4M |
|
671
PUT
DexCom
DXCM
$27.6B
| $14.5M | 0.01% |
212,900
-128,700
| -38% | -$10.5M |
|
672
PUT
Kraft Heinz
KHC
$30.8B
| $14.5M | 0.01% |
475,300
+41,000
| +9% | +$1.23M |
|
673
CALL
Dutch Bros
BROS
$8.91B
| $14.4M | 0.01% |
234,000
+157,000
| +204% | +$10.3M |
|
674
PUT
Cleveland-Cliffs
CLF
$5.39B
| $14.4M | 0.01% |
1,756,700
+282,300
| +19% | +$2.87M |
|
675
PUT
PG&E
PCG
$39.9B
| $14.4M | 0.01% |
839,600
-207,600
| -20% | -$3.44M |
|
Similar funds
Simplex Trading's Q1 2025 Portfolio in Review
As of Q1 2025, Simplex Trading held 10,070 positions worth $156B, down 13% from $179B the previous quarter. Its ten largest holdings account for 51% of the portfolio.
Simplex Trading withdrew a net $7.93B in Q1 2025, closing 1,547 positions and reducing 3,654 holdings. Its most notable exit was Alibaba, an estimated $66.7M position sold in full.
By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.68% a quarter earlier, followed by Consumer Discretionary and Healthcare.
Against the trend, Simplex Trading opened a new position in iShares 20+ Year Treasury Bond ETF worth $278M.
- Simplex Trading's largest Q1 2025 buy was iShares 20+ Year Treasury Bond ETF: 3,057,978 shares worth $278M.
- Simplex Trading added most to NVIDIA in Q1 2025, an estimated $89.9M increase.
- Simplex Trading's biggest Q1 2025 reduction was Apple, cutting an estimated $518M.
- Simplex Trading fully exited Alibaba in Q1 2025, selling an estimated $66.7M.
- Simplex Trading's ten largest holdings make up 51% of its $156B portfolio in Q1 2025.
- Simplex Trading opened 1,566 new positions and closed 1,547 in Q1 2025.
- Simplex Trading's portfolio value fell 13% quarter-over-quarter to $156B.
Based on Simplex Trading's 13F filing for Q1 2025, filed 12 May 2025.